JPH078205Y2 - Thermal recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a thermal recording apparatus in which heat-sensitive recording paper before recording is accommodated in a roll, and particularly to the shape of the thermal recording head.

[Conventional technology]

FIG. 8 is a sectional view showing a thermal recording head in a conventional thermal recording apparatus. In the figure, (1) is a heat radiating plate for radiating the heat generated in the thermal recording head (6), and (2) is a heat insulating layer. , Conductive layer,
An alumina substrate on which a heating resistance layer and a heat conduction layer are formed,
(3) is a thermosensitive recording paper on which recording information is recorded, which is stored in a roll before recording, and (4) is a thermosensitive recording paper (3).
Is a platen roller for pressing the thermal recording head (6) to convey the thermal recording paper (3), and (5) is a portion pressed by the platen roller (4) of the thermal recording head (6), It is a heat generating part for applying heat to the heat sensitive recording paper (3). The heat generating part (5) is composed of the heat insulating layer, the conductive layer, the heat generating resistance layer and the heat conductive layer. Reference numeral (6) is a thermal recording head comprising a heat sink (1), an alumina substrate (2), a conductive layer, a heat generating resistance layer and a heat conductive layer, and records recorded information on the thermal recording paper (3). Also, the heat generating part (5) is formed almost flat, or the radius R is about 10 mm and the height is 50 μm or more.
It is formed in an arc shape of about 100 μm. However, there is no curling effect at the radius and height of this arc. Therefore, since the thermosensitive recording paper (3) before recording is in a roll shape,
A complicated curl removing device (not shown) is provided to remove the curl.

[Problems to be solved by the invention]

Since the conventional thermal recording device is configured as described above,
It is necessary to provide a complicated curl removing device for removing curl curl of the thermal recording paper (3), which causes problems such as an increase in size and cost of the device.

The present invention has been made to solve the above problems, and an object thereof is to obtain an inexpensive and compact thermal recording device capable of performing sufficient curl removal without requiring the conventional curl curl removal device. To do.

[Means for solving problems]

In a thermal recording apparatus according to the present invention, at least a substrate provided with a heat generating layer, a heat generating portion formed on the substrate, and a curl curling in a direction facing the heat generating portion and circumscribing the substrate side are provided. In a thermal recording apparatus including a platen roller that feeds thermal paper, an arc portion is projected on the substrate so as to face the platen roller, and the arc portion extending in the width direction of the platen roller is provided at the top of the arc portion. A heat sensitive portion is formed, the radius of the arc portion is 3 mm or more and 4 mm or less, the protruding height is 300 μm or more from the flat portion of the substrate, and the platen roller is pressed against the heat generating portion by 100 g / cm to 200 g / cm. The deformed engagement is made along the shape of the arc portion.

[Action]

In the thermal recording apparatus of the present invention, an arc portion is projected on the substrate so as to face the platen roller, and a heat sensitive portion is formed on the top of the arc portion extending in the width direction of the platen roller.
The radius of this arc is 3 mm or more and 4 mm or less, the protrusion height is 300 μm or more from the flat part of the substrate, and the platen roller deforms along the shape of the arc by the heat generating part and the pressing force of 100 g / cm to 200 g / cm. The curling curl of the heat-sensitive recording paper is removed by heating by the heat-recording head and the platen roller and by the squeeze effect.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a sectional view showing a thermal recording head in a thermal recording apparatus showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a heat generating portion (5a) in FIG. The same symbols as are the same or corresponding parts. (5a) is a heat generating portion having a convex and arcuate shape which is pressed by the platen roller (4) of the thermal recording head (6),
It is composed of a conductive layer (51), a heating resistance layer (52), a heat insulating layer (53), and a heat conductive layer (54). The radius R of the arc is 3 mm or more and 4 mm or less, and the height H is 300 μm or more from the flat portion of the alumina substrate (2). (Five
1) is a conductive layer that guides power from a drive circuit (not shown), (52) is a heating resistance layer that generates heat when power is applied to the conductive layer (51), and (53) is an alumina substrate A heat insulating layer which is formed on (2) and insulates heat generated in the heat generating resistance layer (52), and (54) is a conductive layer (51) and a heat generating resistance layer ( 52) is a heat conductive layer that prevents abrasion. Further, the heat insulating layer (53) has a convex shape and an arc shape in a portion pressed by the platen roller (4), and the conductive layer (51), the heat generating resistance layer (52), and the heat conductive layer (54). ) Is formed along the heat insulating layer (53).

With the above configuration, the thermosensitive recording paper (3), which was stored in a roll shape before recording, is conveyed while being sandwiched between the platen roller (4) and the heat generating portion (5a). At this time, the heat generated by the heat generating portion (5a) and the platen roller (4) are deformed and engaged along the convex arc provided with the heat generating portion (5a) so that the shearing effect is caused. Then, curl curls possessed by the thermal recording paper (3) are removed. According to the experimental results, the pressing force of the platen roller (4) is 100 g / cm to 200 g / cm in the case of ordinary thermal recording paper, so the convex and arc-shaped radius R is 3 to 4 m to remove the curl.
It was effective if the height H at m was at least about 300 μm from the flat portion of the alumina substrate (2). However, if the radius R is 5 mm or more, no curling effect is obtained,
When the radius R is 2 mm or less, the curling effect becomes too large, and conversely, a curl having a diameter of about 30 to 50 mm is generated. Note that the upper limit of the height H from the flat portion of the alumina substrate (2) is about the ordinary platen roller (4).
Since the pressing force of is 100 g / cm to 200 g / cm, there is an upper limit on the arc surface that contributes to the curling effect between the platen roller (4) and the heat generating part (5a), and it is inevitably determined.

In the above embodiment, the heat insulating layer (53) of the heat generating part (5a) is formed in an arc shape, and the conductive layer (51), the heat generating resistance layer (52) and the heat conductive layer (54) are arranged along the heat insulating layer (53). However, the heat-generating part (5a) is formed by forming the heat-conducting layer (54) or the conductive layer (51) and the heat-generating resistance layer (52) in an arc shape. ) May be formed in an arc shape.

Further, the alumina substrate (2) below the heat generating part (5a) is formed into a convex shape and an arc shape, and the heat insulating layer (53), the conductive layer (51), the heat generating resistance layer (52) and the heat conductive layer (54) are arranged along the alumina substrate (2). ) May be formed into a film.

Further, the constituent elements of the heat generating section (5a) are not limited to the heat insulating layer (53), the conductive layer (51), the heat generating resistance layer (52) and the heat conducting layer (54).

[Effect of device]

As described above, according to the present invention, the heat generating portion pressed by the platen roller of the thermal recording head has a radius of 3 mm or more and 4 mm or less and the protrusion height is at least 300 μm from the flat portion of the substrate on which the heat generating layer is provided. Since it is formed in an arc shape, the conventional curl-eliminating device is not required, and the curl-eliminating effect which is sufficient in practical use can be obtained, and a small and inexpensive device can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a thermal recording head of a thermal recording apparatus according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a heat generating portion in FIG. 1, and FIG. 3 is a thermal recording of a conventional thermal recording apparatus. It is sectional drawing which shows a head. (2) is an alumina substrate, (3) is a thermal recording paper, (4) is a platen roller, (5a) is a heat generating portion, (51) is a conductive layer,
Reference numeral (52) is a heating resistance layer, (53) is a heat insulating layer, (54) is a heat conduction layer, and (6) is a thermal recording head. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A substrate provided with at least a heat generating layer, a heat generating portion formed on the substrate, and facing the heat generating portion,
In a thermal recording apparatus including a platen roller that feeds a thermal paper having a curl curl in a direction circumscribing the substrate side, an arc portion is projected on the substrate facing the platen roller, and the platen roller is provided. The heat-sensitive portion is formed on the top of the arc portion extending in the width direction of the arc, the radius of the arc portion is 3 mm or more and 4 mm or less, the protrusion height is 300 μm or more from the flat portion of the substrate, and the platen roller generates the heat. A thermal recording device characterized in that it is deformably engaged with the portion along the shape of the arc portion by a pressing force of 100 g / cm to 200 g / cm.